Partially revert backport of commit 284c470

Revert cases in the last backport that converted "\[" in strings to "[",
which results in an error when eval-defun is called on them.

lisp/org-footnote.el

@@ -259,7 +259,7 @@ positions, and the definition, when inlined."
 
 This matches only pure definitions like [1] or [fn:name] at the
 beginning of a line.  It does not match references like
-[fn:name:definition], where the footnote text is included and
+\[fn:name:definition], where the footnote text is included and
 defined locally.
 
 The return value will be nil if not at a footnote definition, and

lisp/org.el

@@ -4041,8 +4041,8 @@ images at the same place."
 
 (defcustom org-format-latex-header "\\documentclass{article}
 \\usepackage[usenames]{color}
-[PACKAGES]
-[DEFAULT-PACKAGES]
+\[PACKAGES]
+\[DEFAULT-PACKAGES]
 \\pagestyle{empty}             % do not remove
 % The settings below are copied from fullpage.sty
 \\setlength{\\textwidth}{\\paperwidth}
@@ -7441,7 +7441,7 @@ a block.  Return a non-nil value when toggling is successful."
 (defconst org-goto-help
   "Browse buffer copy, to find location or copy text.%s
 RET=jump to location             C-g=quit and return to previous location
-[Up]/[Down]=next/prev headline   TAB=cycle visibility   [/] org-occur")
+\[Up]/[Down]=next/prev headline   TAB=cycle visibility   [/] org-occur")
 
 (defvar org-goto-start-pos) ; dynamically scoped parameter
 
@@ -24087,7 +24087,7 @@ no special treatment.  In particular, a simple \\[universal-argument] prefix \
 will just
 plainly yank the text as it is.
 
-[1] The test checks if the first non-white line is a heading
+\[1] The test checks if the first non-white line is a heading
     and if there are no other headings with fewer stars."
   (interactive "P")
   (org-yank-generic 'yank arg))

lisp/ox.el

@@ -6238,8 +6238,8 @@ back to standard interface."
 	    (concat
 	     ;; Options are hard-coded.
 	     (format "[%s] Body only:    %s           [%s] Visible only:     %s
-[%s] Export scope: %s       [%s] Force publishing: %s
-[%s] Async export: %s\n\n"
+\[%s] Export scope: %s       [%s] Force publishing: %s
+\[%s] Async export: %s\n\n"
 		     (funcall fontify-key "C-b" t)
 		     (funcall fontify-value
 			      (if (memq 'body options) "On " "Off"))